News tagged with copulatory organ
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Search results for copulatory organ
Shape, fit of reproductive organs evolve quickly and in concert, leaving size behind
Believed critical for determining which individuals can -- or cannot -- successfully reproduce with each other, genitalia not only figure prominently in the origin of new species, but are also typically the ...
Dec 15, 2011 |
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Mating mites trapped in amber reveal sex role reversal
In the mating game, some female mites are mightier than their mates, new research at the University of Michigan and the Russian Academy of Sciences suggests. The evidence comes, in part, from 40 million-year-old ...
Feb 28, 2011 |
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Females shut down male-male sperm competition in leafcutter ants
Leafcutter ant queens can live for twenty years, fertilizing millions of eggs with sperm stored after a single day of sexual activity.
Mar 18, 2010 |
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How 'secondary' sex characters can drive the origin of species
The ostentatious, sometimes bizarre qualities that improve a creature's chances of finding a mate may also drive the reproductive separation of populations and the evolution of new species, say two Indiana University Bloomington ...
Biology /
Aug 25, 2008 |
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New evidence for female control in reproduction
Adding another layer of competition to the mating game, scientists are reporting possible biochemical proof that the reproductive system of female mammals can “sense” the presence of sperm and react to it by changing the ...
Biology /
Nov 19, 2007 |
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Evolution is deterministic, not random, biologists conclude from multi-species study
A multi-national team of biologists has concluded that developmental evolution is deterministic and orderly, rather than random, based on a study of different species of roundworms. The findings are reported in the latest ...
Biology /
Nov 19, 2007 |
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'Scent of a woman' tells male redback spiders to find a mate
If men think finding a nice partner to settle down and raise children with is tough, consider the plight of the male Australian redback spider. Instead of personality conflicts, spats over in-laws and financial ...
Apr 05, 2006 |
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Ancient asexuals: the boys are back in town
The record-holders for the longest abstinence from sex may be about to lose their status, following a discovery on a Japanese island. Every specimen of darwinulid ostracod (a shrimp-like freshwater animal with ...
Mar 23, 2006 |
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Certain female fish have special mating preference
Ladies' choice A biologist at Washington University in St. Louis has shown that for some fish species, females prefer males with larger sexual organs, and actually choose them for mating. That does not exclude ...
May 15, 2005 |
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List of search results for copulatory organ
